EP0929116A1 - Antenne - Google Patents

Antenne Download PDF

Info

Publication number
EP0929116A1
EP0929116A1 EP98124040A EP98124040A EP0929116A1 EP 0929116 A1 EP0929116 A1 EP 0929116A1 EP 98124040 A EP98124040 A EP 98124040A EP 98124040 A EP98124040 A EP 98124040A EP 0929116 A1 EP0929116 A1 EP 0929116A1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna unit
basic body
conductor
antenna device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98124040A
Other languages
German (de)
English (en)
Other versions
EP0929116B1 (fr
Inventor
Seiji c/o Intellectual Property Dept. Kanba
Teruhisa c/o Intellectual Property Dept. Tsuru
Harufumi c/o Intellectual Property Dept. Mandai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0929116A1 publication Critical patent/EP0929116A1/fr
Application granted granted Critical
Publication of EP0929116B1 publication Critical patent/EP0929116B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Definitions

  • the present invention relates to an antenna device, and in particular relates to an antenna device for use in a radio equipment such as a mobile communication apparatus, a radio communication LAN (Local Area Network), a television, a radio, etc.
  • a radio equipment such as a mobile communication apparatus, a radio communication LAN (Local Area Network), a television, a radio, etc.
  • the inverted F-type antenna 50 is composed of a printed-circuit board 52 which is made of a glass-filled epoxy resin of a relative dielectric constant of 4 to 5 and on a surface of which a ground electrode 51 connected to the ground electric potential is provided, and a radiator plate 53 which is made of a metal plate arranged in parallel with the printed-circuit board 52 and above the printed-circuit board 52.
  • the radiator plate 53 fulfills the function of radiating a radio wave, and its length is ⁇ /4 ( ⁇ : wavelength of the radio wave).
  • a short pin 54 extended toward the printed-circuit board 52 is integrally provided with the radiator plate 53.
  • the short pin 54 is electrically connected to the ground electrode 51 on the printed-circuit board 52. That is, the radiator plate 53 is short-circuited to the ground electrode 51 through the short pin 54.
  • a coaxial cable connection portion 52a is provided, and to the coaxial cable connection portion 52a a coaxial cable, a connector, etc. (not illustrated) through which a load dispatching to the radiator plate 53 takes place, are connected through a connection terminal 53a led out from the radiator plate 53.
  • Preferred embodiments of the present invention are provided to overcome the above described problems, and provide an antenna device of small size and having a high gain.
  • the preferred embodiment of the present invention provides an antenna device, comprising: an antenna unit including; a basic body made of at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed inside or on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor, disposed on the surface of the basic body; a mounting board on which said antenna unit is mounted; a ground part in association with said mounting board and adapted to resonate with said antenna unit; and a length in the polarization direction of a radio wave of said ground part being about ⁇ /4 or more, where ⁇ is a wavelength of the radio wave.
  • said ground part may comprise at least one of a ground electrode disposed on said mounting board and a ground portion of a high-frequency circuit portion mounted on said mounting board together with said antenna unit.
  • the antenna device comprises an antenna unit and a ground part resonant with the antenna unit having ⁇ /4 as the length in the polarization direction of a radio wave
  • the antenna unit is able to function as one pole of a dipole antenna
  • the ground part resonant with the antenna unit is able to function as the other pole of the dipole antenna. Therefore, at a resonant point the antenna unit and ground part are able to act as a pair of antennas like a dipole antenna.
  • an antenna device having as high a gain as a dipole antenna is made available although the antenna device is small-sized.
  • a radio equipment mounted with such a small-sized antenna device having a high gain is also able to be made of small size and of a high gain.
  • the antenna device 10 is composed of an antenna unit 13 having a conductor 11 and a feeding electrode 12 connected to one end of the conductor 11, a power supply 14 connected to the feeding electrode 12, and a mounting board 17 having a linear conductor pattern 15 formed by printing conductive material on the surface and a ground electrode 16 is substantially rectangular shape.
  • the antenna unit 13 is mounted on the mounting board 17, and the feeding electrode 12 on the antenna unit 13 and the power supply 14 are connected through the conductor pattern 15 on the surface of the mounting board 17.
  • the ground electrode 16 on the surface of the mounting board 17 becomes a ground part resonant with the antenna unit 13.
  • the length in the polarization direction of a radio wave (horizontally polarized wave: direction x in Fig. 1, vertically polarized wave: direction y in Fig. 1) of the ground electrode 16 on the surface of the mounting board 17 as the ground part is ⁇ /4 or more ( ⁇ : wavelength of a radio wave).
  • the antenna unit 13 comes to function as one pole of a dipole antenna
  • the ground electrode 16 on the surface of the mounting board 17 as the ground part resonant with the antenna unit 13 comes to function as the other pole of the dipole antenna
  • the antenna unit 13 is composed of a basic body of a rectangular solid, a conductor 11 spirally wound in the longitudinal direction of the basic body 18 inside the basic body 18, and a feeding electrode 12 for applying a voltage to the conductor 11, provided on the surface of the basic body 18.
  • the basic body 18 is composed of rectangular thin layers 19a through 19c laminated which are made of dielectric ceramic having barium oxide, aluminium oxide, silica as its main components. Out of these thin layers, on the surface of the thin layers 19a, 19b substantially L-shaped or substantially straight conductor patterns 20a through 20h of copper or copper alloy are formed by screen printing, evaporation, or plating. And at fixed positions (both ends of conductor patterns 20e through 20g, one end of conductor pattern h), via holes are formed in the thickness direction.
  • a conductor 11 spirally wound in the longitudinal direction of the basic body 18 inside the basic body 18 is formed by sintering.
  • one end of the conductor 11 led out to the end surface of the basic body 18 constitutes a power supply portion 22 and is connected to a feeding electrode 12 disposed on the surface of the basic body 18.
  • the other end of the conductor 11 constitutes an open end 23 inside the basic body 18.
  • FIGs. 4 and 5 perspective views of modifications of the antenna unit 13 in Fig. 2 are shown.
  • an antenna unit 13a in Fig. 4 a basic body 18a of a rectangular solid, a conductor 11a spirally wound in the longitudinal direction of the basic body 18a along the surface of the basic body 18a, and a feeding electrode 12a disposed on the surface of the surface of the basic body 18a are given.
  • one end of the conductor 11a is connected to the feeding electrode 12a for applyingt a voltage to the conductor 11a on the surface of the basic body 18a.
  • the other end of the conductor 11a constitutes an open end 23a on the surface of the basic body 18a.
  • the antenna unit 13a constructed in this way because the conductor 11a is able to be easily formed by screen printing, etc. in a spiral way on the surface of the basic body 18a, the manufacturing processes of the antenna unit 13a can be simplified.
  • a basic body 18b of a rectangular solid, a conductor 11b meanderingly provided on the surface of the basic body 18b, and a feeding electrode 12b formed on the surface of the basic body 18b are given.
  • one end of the conductor 11b is connected to the feeding electrode 12b for applying a voltage to the conductor 18b on the surface of the basic body 18b.
  • the other end of the conductor 12b constitutes an open end 23b on the surface of the basic body 18b.
  • the conductor 11b is meanderingly provided on only one major surface of the basic body 18b, it becomes possible lower the height of the basic body 18b and it becomes possible to lower the height of the antenna unit 13b accordingly. Further, even if the conductor 11b of a meandering shape is provided inside the basic body 18b, the same effect can be obtained.
  • the maximum gain (dBd) practically measured using the antenna device 10 (Fig. 1) is shown in Table 1.
  • an antenna unit having the dimensions of 8 mm (transverse) x 5 mm (longitudinal) x 2.5 mm(height) was used, and by changing the transverse length (X in Fig. 1) and the longitudinal length (Y in Fig. 1) of the ground electrode 16 as the ground part of the antenna unit 13 the change of the maximum gain (dBd) of a horizontally polarized wave (polarized wave in the direction of X in Fig. 1) and a vertically polarized wave (polarized wave in the direction of Y in Fig. 1) was investigated.
  • FIG. 6 a top view of a second preferred embodiment of an antenna device according to the present invention is shown.
  • the antenna device 30 is composed of an antenna unit 13 having a conductor 11 and a feeding electrode 12 with one end of the conductor 11 connected, a high-frequency circuit portion 32 with the feeding electrode 12 connected and with a ground portion 31 made of a metal chassis, and a mounting board 33 having a linear conductor pattern 15 formed by printing conductive material on the surface.
  • the antenna unit 13 and the high-frequency circuit portion 32 are mounted on the mounting board 33, and the feeding electrode 12 of the antenna unit 13 and the high-frequency circuit portion 32 are connected through the conductor pattern 15 on the surface of the mounting board 33.
  • the ground portion 31 of the high-frequency circuit portion 32 mounted on the mounting board 33 constitutes a ground part resonant with the antenna unit 13. More, the length in the polarization direction of a radio wave of the ground portion 31 as the ground part, of the high-frequency circuit portion 32 has been more than ⁇ /4 ( ⁇ : wavelength of a radio wave) (horizontally polarized wave: direction x in Fig. 6, vertically polarized wave: direction y in Fig. 6).
  • the antenna unit 13 comes to act as one pole of a dipole antenna, and the ground portion 31 of the high-frequency circuit portion 32 in the function of the ground part resonant with the antenna unit 13 as the other pole of the dipole antenna.
  • the antenna device 40 is composed of an antenna unit 13 having a conductor 11and a feeding electrode 12 with one end of the conductor 11 connected, a high-frequency circuit portion 32 with the feeding electrode 12 connected and with a ground portion 31 made of a chassis, and a mounting board 17 having a linear conductor pattern 15 formed by printing conductive material on the surface and a ground electrode 16 in substantially rectangular form.
  • the antenna unit 13 and the high-frequency circuit portion 32 are mounted on the mounting board 33, and the feeding electrode 12 of the antenna unit 13 and the high-frequency circuit portion 32 are connected through the conductor pattern 15 on the surface of the mounting board 17.
  • the ground electrode 16 on the surface of the mounting board 17 and the ground portion 31 of the high-frequency circuit portion 32 mounted on the mounting board 17 constitute a ground part resonant with the antenna unit 13.
  • the length in the polarization direction of a radio wave horizontally polarized wave: direction x in Fig. 7, vertically polarized wave : direction y in Fig. 7 of the ground electrode 16 on the surface of the mounting board 17 and the grounding portion 31 of the high-frequency circuit portion 32 both of which function as the ground part, has been more than ⁇ /4 ( ⁇ : wavelength of a radio wave).
  • the antenna unit 13 comes to function as one pole of a dipole antenna, and the ground electrode 16 on the surface of the mounting board 17 and the grounding portion 31 of the high-frequency circuit portion 32 which function as the ground part resonant with the antenna unit 13 as the other pole of the dipole antenna.
  • the antenna unit is able to act as one pole of a dipole antenna, and the ground part resonant with the antenna unit as the other pole of the dipole antenna.
  • an antenna unit and a ground part are able to act as one pair of antennas like a dipole antenna.
  • an antenna device having as high a gain as a dipole antenna is able to be obtained although it is small-sized.
  • a radio equipment mounted with such a small-sized antenna device having a high gain becomes of small size and of a high gain.
  • an antenna device of the first preferred embodiment because the antenna device is able to be applied to an antenna device in which the power is supplied to the antenna unit from a power supply, an antenna device which is of small size and is more simplified is realized.
  • the antenna device is able to be applied to an antenna device in which the power is supplied to the antenna unit from a high-frequency circuit portion such as a VCO, a switching circuit, etc.
  • the antenna device is able to be mounted on a radio equipment as it is, and as the result the manufacturing processes of the radio equipment is made simplified.
  • an antenna device of the second preferred embodiment because a ground electrode on the surface of a mounting board to mount an antenna unit and a ground portion of a high-frequency circuit portion constitute a ground part resonant with the antenna unit, even if the antenna device has been made of small size, the length in the polarization direction of a radio wave of the ground part resonant with the antenna unit comes to satisfy the condition of about ⁇ /4 or more. Therefore, the antenna device becomes further small-sized and a radio equipment mounted with this antenna device is able to become of small size.
  • the basic body of the chip-antenna is made of dielectric material having barium oxide, aluminium oxide, silica as its main components
  • the material of the basic body is not limited to them. Even if a dielectric material having titanium oxide and neodymium oxide as its main components, a magnetic material having nickel, cobalt, and iron as its main components, or a combination of dielectric material and magnetic material is used, the same effect can be obtained.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP19980124040 1998-01-06 1998-12-17 Antenne Expired - Lifetime EP0929116B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP88398A JPH11195917A (ja) 1998-01-06 1998-01-06 アンテナ装置
JP88398 1998-01-06

Publications (2)

Publication Number Publication Date
EP0929116A1 true EP0929116A1 (fr) 1999-07-14
EP0929116B1 EP0929116B1 (fr) 2005-06-29

Family

ID=11486081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980124040 Expired - Lifetime EP0929116B1 (fr) 1998-01-06 1998-12-17 Antenne

Country Status (3)

Country Link
EP (1) EP0929116B1 (fr)
JP (1) JPH11195917A (fr)
DE (1) DE69830704T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1109250A1 (fr) * 1999-12-08 2001-06-20 Kabushiki Kaisha Toshiba Dispositif de radiocommunication pour un système électronique
EP1202382A2 (fr) * 2000-10-31 2002-05-02 Mitsubishi Materials Corporation Antenne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006186969A (ja) * 2004-12-01 2006-07-13 Omron Corp アンテナ
JP2007096363A (ja) 2005-08-31 2007-04-12 Tdk Corp モノポールアンテナ
JP5398021B2 (ja) * 2010-10-21 2014-01-29 Ｎｅｃアクセステクニカ株式会社 アンテナ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590534A1 (fr) * 1992-09-28 1994-04-06 Ntt Mobile Communications Network Inc. Unité radio portable
WO1995005011A1 (fr) * 1993-08-09 1995-02-16 Motorola, Inc. Antenne doublet sur circuit imprime
EP0706231A1 (fr) * 1994-10-04 1996-04-10 Mitsubishi Denki Kabushiki Kaisha Equipement d'antenne
EP0795922A1 (fr) * 1996-03-11 1997-09-17 Murata Manufacturing Co., Ltd. Circuit d'adaptation et dispositif d'antenne
EP0828310A2 (fr) * 1996-09-10 1998-03-11 Murata Manufacturing Co., Ltd. Dispositif d'antenne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590534A1 (fr) * 1992-09-28 1994-04-06 Ntt Mobile Communications Network Inc. Unité radio portable
WO1995005011A1 (fr) * 1993-08-09 1995-02-16 Motorola, Inc. Antenne doublet sur circuit imprime
EP0706231A1 (fr) * 1994-10-04 1996-04-10 Mitsubishi Denki Kabushiki Kaisha Equipement d'antenne
EP0795922A1 (fr) * 1996-03-11 1997-09-17 Murata Manufacturing Co., Ltd. Circuit d'adaptation et dispositif d'antenne
EP0828310A2 (fr) * 1996-09-10 1998-03-11 Murata Manufacturing Co., Ltd. Dispositif d'antenne

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1109250A1 (fr) * 1999-12-08 2001-06-20 Kabushiki Kaisha Toshiba Dispositif de radiocommunication pour un système électronique
US6728559B2 (en) 1999-12-08 2004-04-27 Kabushiki Kaisha Toshiba Radio communication device and electronic apparatus having the same
EP1202382A2 (fr) * 2000-10-31 2002-05-02 Mitsubishi Materials Corporation Antenne
KR100876609B1 (ko) * 2000-10-31 2008-12-31 미츠비시 마테리알 가부시키가이샤 안테나
EP1202382B1 (fr) * 2000-10-31 2011-12-07 Mitsubishi Materials Corporation Antenne

Also Published As

Publication number Publication date
EP0929116B1 (fr) 2005-06-29
JPH11195917A (ja) 1999-07-21
DE69830704T2 (de) 2006-05-04
DE69830704D1 (de) 2005-08-04

Similar Documents

Publication Publication Date Title
US6271803B1 (en) Chip antenna and radio equipment including the same
US6222489B1 (en) Antenna device
EP1018779B1 (fr) Antenne plane à double fréquence et appareil de radio utilisant une telle antenne
US5917450A (en) Antenna device having two resonance frequencies
KR100798044B1 (ko) 칩형 안테나 소자와 안테나 장치 및 이것을 탑재한 통신기기
EP0944128B1 (fr) Antenne et dispositif radio portable l'utilisant
JP3738577B2 (ja) アンテナ装置及び移動体通信機器
US6970135B2 (en) Antenna apparatus
EP1756908B1 (fr) Procede et dispositif permettant de charger des antennes planes
KR100265510B1 (ko) 전 방향성 안테나
JP2004088218A (ja) 平面アンテナ
JP2001339226A (ja) アンテナ装置
JP2005094360A (ja) アンテナ装置および無線通信装置
US20060290575A1 (en) Antenna integrated into a housing
EP0860896B1 (fr) Dispositif d'antenne
JP3586915B2 (ja) 車両用アンテナ装置
JP4263972B2 (ja) 表面実装型アンテナおよびアンテナ装置ならびに無線通信装置
EP0828310B1 (fr) Dispositif d'antenne
JPH11340726A (ja) アンテナ装置
JP2001251128A (ja) 多周波アンテナ
EP0929116B1 (fr) Antenne
US20040125033A1 (en) Dual-band antenna having high horizontal sensitivity
US6618015B2 (en) Antenna for use with radio device
JPH09232854A (ja) 移動無線機用小型平面アンテナ装置
JP2917316B2 (ja) アンテナ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19981217

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid

Free format text: DE FR GB SE

17Q First examination report despatched

Effective date: 20040614

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69830704

Country of ref document: DE

Date of ref document: 20050804

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050929

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20060330

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20071212

Year of fee payment: 10

Ref country code: FR

Payment date: 20071210

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20071213

Year of fee payment: 10

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20081217

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20090831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081231